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. J. A. 83H. A. LAMPLUGH. COMBINED PRESSURE GAGE AND SAFETY VALVE FOR PNEUMATIC TIRES.

NO, 511,706, Patented Dec. 26, 1893,

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J. A. & H. A. LAMPLUGH'. COMBINED PRESSURE GAGE AND SAFETY VALVE FOR PNEUMATIUTIRES.

N0. 511*,706. Patented Dec. 26, 1893.

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J. A. & H. A. LAMPLUGH. GOMBINED PRESSURE GAGE AND SAFETY VALVE FOR PNEUMATIG TIRES..

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JAMES ALFRED LAMPLUGH AND HENRY ARTHUR LAMPLUGII, OF BIRMING- HAM, ENGLAND; SAID HENRY ARTHUR LAMPLUGII ASSIGNOR TO SAID JAMES ALFRED LAMPLUGH.

COMBINED PRESSURE-GAGE AND SAFETY-VALVE FOR PNEUMATIC TIRES.

SPECIFICATION forming part of Letters Patent No. 511,706, dated December 26, 1893. Application filed May 17,1893. Serial No. 474,579. (No model.)

To aZZ whom it may concern; lows: The india rubber tube constituting a 50 Be it known that we, JAMES ALFRED LAMP- valve opening inward, when the parts are LUGH and HENRY ARTHUR LAMPLUGH, both in their normal position, closes the passage of Birmingham, England, subjects of the through which the compressed air passes to Queen of Great Britain, have invented a certhe tire; the valve on the hollow stem is tain new or Improved Combined Pressure pressed to its seat by the coiled spring. When 55 Gage and Safety-Valve for the Inflated Tires air is pumped into the tire until it reaches the of the Vheels of Bicycles, Tricycles, and determined pressure any further introducother Velocipedes and Carriages; and we do tion of air produces an increased pressure hereby declare that the following is a full, which raises the valve from its seat and perclear, and exact description of the invention, mits the escape of the excess of air. If the 60 which will enable others skilled in the art to air becomes heated or from any cause exceeds which it appertains to make and use the same. the adjusted pressure it similarly escapes.

Our said invention consists of the construc- The pressure which it is wished the air in tion and combination of parts hereinafter dethe tire shall not exceed is determined by scribed constitutinga new or improved comscrewing home more or less the cap which 65 bined pressure gage and safety valve, wherecompresses the coiled spring holding down by the' pressure of the air pumped into the the valve and the parts may be graduated so inflated or pneumatic tires of bicycles, trias to indicate the adjusted pressure.

cycles and other velocipedes can be deter- Figure 1 of the accompanying drawings mined at pleasure and the escape of air perrepresents in vertical section and Fig. 2 rep- 7e mitted if by accident or otherwise the pressresents in plan, our new or improved comure of the air in the tire momentarily exbined pressure gage and safety valve in conceed the arranged pressure. The injury to junction with an air admission valve, the apthe tire which sometimes occurs by the inparatns being applied to the tire of a wheel cautious introduction of an excess of air or for inflating the same. Fig. 3 represents in 75 by the heating and consequent expansion of elevation and Fig. 4 in plan a modified arthe air is thus prevented. lVe make a valve rangement in which the hollow stem to which somewhat resembling the ordinary valve, that the compressing pump is connected is sittiis, having a hollow stem to which the comated at right angles to the axis of the case or pressing pump is connected bya flexible pipe, chamber of the apparatus. The position of 80 the said hollow stem havingasmall side hole. the hollow stem represented in Figs. 3 and 4 The said stem is covered by a close fitting is more convenient for connecting the comindia rubber tube which constitutes an air pressing pump than that represented inrFigs.

admission valve opening inward, the india 1 and 2. Figs. 5, 6, 7, 8, 9, l0 and 11 reprerubber being raised from the said side hole sent, drawn to a larger scale, the apparatus 8 and allowing air to pass by the pressure of represented in Figs. 1 and 3, Fig. 5 representthe air forced into the hollow stem by the ing a side elevation; Fig. 6 a vertical section pump. The said hollow stem is situated in a and Fig. 7 a horizontal section of the appa- 0 chamber or case communicating with the inratus. Fig. 8 represents an elevation and terior of the tire and the said chamber is pro- Fig. 9 a horizontal section of the hollow stem 0 vided with a valve seat on which the air adand safety valve carried by it; and Fig. 10 mission valve carried by the hollow stem represents a section and Fig. 11 a plan of the seats itself, being pressed to its seat by a tubular case or chamber detached. Fig. 12

5 coiled spring around the said stem. By represents in elevation and Fig. 13 in vertical means of a screw cap the said spring can be section, drawn to a larger scale, the apparatus 9 5 compressed to a greater or less degree and represented in Figs. 3 and 4t, and Fig. 14 repthe valve pressed to its seat with greater or resents in plan the hollow stem detached. less force. The action of the parts is as fol- The same letters of reference indicate the same parts in the several figures of the drawings.

a is the tubular case or chamber of the apparatus screwed to the ordinary hollow nipple b in connection with the air tube of the pneumatic or inflated tire c of the wheel.

01 is the hollow stem to the outer end of which the flexible tube of the compressing pump is screwed as usual, the said outer end of the stem being covered by the cap e (See Figs. 1, 2, 3 and 4.) The hollow stem cl has at its inner end a small side hole d which s covered by the air admission valve e openlng inward, the said valve e consisting of a close fitting india rubber tube seating itself in a ring like depression in the inner end of thehollowstemd. (SeeFigs.6and 13.) When air is forced into the hollow stem at by the compressingpump the valve or tube 6 is raised from the side hole d and air passes into the nipple b andfrom thence into the air tube of the tire to be inflated.

The air admission Valve 6 constitutes no part of this invention and air admission valves of other kinds may be used in combination with this invention. In the case or chamber a,ourcombined pressure gage and safety valve is contained, the said combined gage and valve, consisting of avalve f and screw cap h. The valve fhas its acting face covered with an india rubber disk which is pressed to the valve seat in the case or chamber a by the coiled spring g. In the apparatus shown in Figs. 1 and 2 and the enlarged views of the same, the valve fis carried by the hollow stem (1, but in the modified apparatus Figs. 3 and 4 and the enlarged views of the same, the valve f is independent of the'hollow stern cl. The bottom of the case or chamber a is closed by the screw cap h upon which one end of the coiled spring 9 takes a bearing so that by screwing the said cap 7t more or less into the case, the spring g can be compressed to a greater or less degree and the valve f pressed to its seat with greater or less force. Thus, the pressure which it is wished the air in the inflated tire shall not exceed, is determined by screwing home more or less the cap it and compressing more or less the coiled spring 9 holding the valve to its seat. In order to indicate the adjusted pressure, graduations may be made on the outside of the case a and a pointer be fixed to the edge of the screw cap 7t. By the rotation of the cap in one or other direction its pointer can be brought to the required graduation on the case so as to adjust the spring to the pressure which it is desired the air in the tire shall attain before the excess of air can escape. Other ways of graduating may be employed. In place of the coiled spring represented for pressing and holding the valve f to its seat, other kinds of springs, such as springs consistingof rods or pieces of vulcanized india rubber, may be employed and coiled or other springs of varying or graduated strength according to the pressure required in the tire may be used. In the case a are holes or vents 'i, q to permit of the escape of air when the valve f is pressed from its seat. Between the upper part of the case a and the lower part in which the valve f works is an air way or passage 7.0. In order that the india rubber disk or seating of the valve f may make as perfect an air tight joint as possible it is preferred to form on the face of the valve seat in the case a a series of fine concentric ribs or ridges. By the pressure of the coiled spring g, the valve disk or seating is pressed forcibly into the depressions or sunken parts between the said fine ribs or ridges and the passage of air between the fixed seat in the case and the india rubber seating or disk of the valve thereby effectually prevented.

When the parts of the apparatus are in their normal positions as represented in Figs. 6 and 13 the air admission valve e closes the passage through which the compressed air passes to the tire and the safety valve f is pressed to its seat by the coiled spring g and communication between the compressed air in the tire and the lower part of the case or chamber in which the valve works out off. When air is pumped into the tire through the hollow stem d and open valve e until the air reaches the determined pressure, any further introduction of air produces an increased pressure which lifts the safety valve f from its seat and permits of the escape of air by the passage 7c, open valve f and vents or holes 1', 2' in the case. On the pressure of the air within the inflated tire being in this way reduced to the arranged pressure the spring'g again closes the valve f. The air similarly escapes should it by becoming heated exceed the adjusted pressure.

I-Iaving now'particularly described and ascertained the nature of this invention and the manner in which the same is to be performed, we declare that we claim as our invention-- The combination with the air admission Valve through which air is pumped into the pneumatic tires of the wheels of velocipedes and carriages, of a combined pressure gage and safety valve consisting of a case or chamber having a valve seat provided with a series of fine concentric annular ribs or ridges, a valve having its acting face covered with an india rubber disk adapted to be pressed into close engag ment with the concentric ridges of the valve seat, a spring bearing on said valve to seat it, and an adjustable screw cap for compressing the spring and holding the valve to its seat with a predetermined pressure, substantially as and for the purpose described.

JAMES ALFRED LAMILUGH. [L 8.] HENRY ARTHUR LAMPLUGH. [L. 8.]

Witnesses:

RICHARD SKERRETT, ARTHUR JOHN POWELL.

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